[rabbitmq-discuss] BasicQoS usage: consuming 1 by 1 messages avoind unacking the whole queue
matthias at rabbitmq.com
Thu Apr 21 10:45:53 BST 2011
On 20/04/11 08:50, Alfonso Pantoja wrote:
> Regarding basic.qos...
> Having prefetchCount=1 what happens if 2 consumers consume from the
> same queue?
basic.qos is a channel setting, so the quota set that way is shared by
all consumers on that channel.
> Consider this scenario:
> *3 messages on the queue Q1: M2, M1
> *2 consumers consuming from Q1: C1, C2
> *Consumers connected using basic.qos(prefetchSize=0, prefetchCount=1,
> 1. Is it possible to achieve this behavior? "C1 gets M1 and C2 does
> not get message M2 until C1 acks or rejects M1" (some kind of
> blocking the queue until messages are acked or rejected)
That can only happen if C1 and C2 are on the same channel.
> setting QoS means that acks or rejects are mandatory?
Unless consuming in noack mode, generally consumers are expected to
(eventually) ack or reject messages they have received.
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